Which tier of vocabulary includes high-frequency words across various disciplines?

Tier 2 words are characterized by their relevance across multiple disciplines and high frequency in written texts, making them essential for academic success. These words are more sophisticated than the everyday vocabulary found in the basic tier (Tier 1) and often appear in various subjects such as literature, science, and social studies. Understanding Tier 2 words allows students to express more complex ideas and engage with diverse texts more effectively.

In contrast, Tier 1 words consist of simple, commonly used words that most children learn early on, such as "cat" or "house." Tier 3 words are domain-specific and usually pertain to subjects that require specialized knowledge, like "photosynthesis" in biology, and are not widely applicable across different contexts. Academic vocabulary encompasses both Tier 2 and some aspects of Tier 3, but specifically focusing on Tier 2 highlights the importance of versatile words that enhance comprehension and communication across fields.